Have searched for this info in vain. My iPhone 4 gets noticeably hotter than my 3G did and it's sizzling if I talk for half an hour. I've had more dropped calls this week than ever with my 3G. Have to decide if this is a deal breaker. I didn't get the phone to use as a griddle and these dropped calls seem related to the new phone (since I'm using it in the same places I used my 3G). A related question: do screen protectors inhibit heat dissipation? My phone is wrapped front and back. Any guidance would be greatly appreciated.